Boiler staybolt construction



I. A. DOWD.

BOILER STAYBOLT CONST.RUCTION.

APPLICATION FILED MAY 9, 1921.

Patented Dec. 13, 1921.

IIII Y'u X I \vwuhoa Bumx I\ mm UNITED STATES PATENT oFrICa;

JOHN A. DOWD, OF FALL RIVER, MASSACHUSETTS.

BOILER STAYBOLT CONSTRUCTION.

Specification of Letters Patent.

Application filed May 9, 1921. Serial 1&0. 467,839.

To all whom itmajq concern:

Be it known that I, JOHN A. Down, a citizen of the United States, residing at Fall River, in the county of Bristol and State of Massachusetts, have invented new and useful Improvements in Boiler Staybolt Constructions, of which the following is a specification.

This invention relates to boiler stay bolt constructions, being more particularly designed where flexible connections are desirable in the fire box portion. The ends of the bolts on the fire side are normally exposed to the intense heat from the fire box and as there is a considerable body of metal at that point these bolt ends are liable to be burned.

This invention provides a construction by which the ends of the bolts are water jacketed, externally of the fire sheet, by water from the boiler, which not only effectually prevents burning of the parts, but adds to the effective heating surface of the boiler.

For a more complete understanding of this invention, together with other objects and advantages thereof, reference may be had to the accompanying drawings illus trating an embodiment thereof, in which- Figure l is a fragmentary crosssection through the fire box portion of the boiler at one of the stay bolts.

Fig. 2 is an elevation partly broken away of a portion of the outside of the firesheet with the bolt in position.

Fig. 3 is a similar view of the inside of the sheet. Fig. 4 is a side elevation of the stay bolt. Referring to Fig. 1,0 and 6 represent the fire sheet and outside sheet respectively of the fire box portion of the boiler. These sheets are perforated at 1 and 2 in substantial alinement for'the reception of the shank of a stay bolt 3, which may I pass loosely therethrough. I

As shown in Figs. land 4 the head4 of this stay bolt is made convex, the inner face thereof being adapted to be seated in a socket member 5 having a central hole inalinement with the hole 1 and positioned on the Outside of the fire sheet a. A nut 6,

also convex, is seated in a similar manner in a socket plate 7 positioned on the outslde of the sheet bf. Adjacent the hole 1, sheet a is perforated at 8, there being mating notches 9 in the socket 5. Caps, -10 and', 1;1- are positioned to house the bolt head 4* and the nut 6, the cap'10 extending externall of: a the perforations 8 and the notches 9. T ese 1 caps are welded tothe sheets a and 6 around their circumferences as shown at 12.The

formation of the bolt head and the nut al'-- Patented nee-13,1921.

lows the bolt a limitedu'ni'versal movement relative to the sheets a and 6 while. retainlng a proper seating engagement therewith. As the cap 10 extends outwardly of theperforations and'notches 9, it is evident that-- water positioned between the sheets a and b in the boiler may circulate about and over.

thebolt head 4. thusforming a water jackettherefor. Furthermore, the. cap 10 projects from the fire side of the sheet a where it is subjected-to intense heat from the fire so that it adds to the effective waterheating a surface of the sheet. I

Having thus described. an embodiment of this invention, it is evident that various.

changes and -modifications might be made therein without departing from its spirit or scope as defined by the appended claims:

-.1. A device ofthe class described comprising a pair of spaced boiler sheets'having a pair of substantially oppositely p0sitioned holes therein,v sockets havin holes therethrough'in alinement with the oles in said sheets, a bolt passed loosely through said-holes and having a rounded head seated in'one socket, a nut'having a rounded head seatedinthe other socket'and threaded on the end of said bolt, and caps inclosin said bolt head and nut made fast to said s eets.

' 2. A device of the class described -co m'-.

prising a pair of spaced boiler sheets having a pair of substantially oppositely pos1- tioned holes therethrough, a socket posi-- through for the reception of the shankof the stay bolt, perforations through said sheetadjacent said hole, a stay bolt in said and made fast to said sheet, and means hole, and a cap inclosing the end of said whereby the inner face of said cap is in comstay bolt and said perforations and made munication with Water on the Water side'of 10 fast t said sheet. said sheet.

4. In combination, a boiler fire sheet In testimony whereof have afiixed my means on the fire side of said sheet for holdsignature. ing a stay belt, a cap covering said means JOHN A. DOWD. 

